Mazda CX-7 2007 Workshop Manual page 1433

SYMPTOM TROUBLESHOOTING [ENTIRE AUDIO SYSTEM]
STEP
• Turn the ignition switch to the LOCK position.
8
• Remove the audio unit.
• Inspect the connection of the audio unit
connector (24-pin) (for sound signal line).
• Is the connector connected securely?
• Is there any noise?
9
• Inspect the ground condition of the antenna.
10
• Is the ground condition normal?
• Is there any noise?
11
End Of Sie
NO.2 NO POWER ON THE ENTIRE AUDIO SYSTEM[ENTIRE AUDIO SYSTEM]
2 No power on the entire audio system/Possible DTC: 09:Er20
Troubleshooting hints
• Poor connection of audio unit connector, terminal damage
• Audio unit malfunction
• Burnt fuse (B+)
• Burnt fuse (ACC)
• Open or short circuit in power supply (B+) wiring harness
• Open or short circuit in power supply (ACC) wiring harness
Diagnostic procedure
STEP
• Turn the ignition switch to the LOCK position.
1
• Inspect the following fuses:
— RADIO
— ROOM
• Are the fuse normal?
• Remove the audio unit.
2
• Inspect the connection of the audio unit
connector (24-pin).
• Disconnect the audio unit connector and
inspect both the audio unit and wiring
harness-side connectors for poor
connection. (such as damaged/pulled-out
pins, corrosion).
— Terminal B (B+)
— Terminal R (ACC)
— Terminal W (GND)
• Are all the pins normal?
INSPECTION
INSPECTION
Yes Go to the next step.
No If poor connection of audio unit connector:
• Securely connect the audio unit connector.
If the audio unit side connector is wrong:
• Replace the audio unit.
If the wiring harness-side connector is wrong:
• Repair or replace the pins and/or the connector.
After treating either the above-mentioned, then go to the
next step.
Yes Go to the next step.
No The system is normal.
Yes Go to the next step.
No Repair or replace the ground. Go to the next step.
Yes Without Bose:
Replace the audio unit.
(See 09-20-4 AUDIO UNIT REMOVAL/INSTALLATION.)
(See 09-20-5 AUDIO UNIT DISASSEMBLY/
ASSEMBLY.)
With Bose:
• If noise occurs from the speaker of a specific channel, or
the volume is minimized and the noise occurs:
— Replace the audio amplifier.
(See 09-20-6 AUDIO AMPLIFIER REMOVAL/
INSTALLATION.)
• If noise occurs from the speaker of two or more channels
or the volume is minimized and the noise dose not
occurs:
— Replace the audio unit.
(See 09-20-4 AUDIO UNIT REMOVAL/
INSTALLATION.)
(See 09-20-5 AUDIO UNIT DISASSEMBLY/
ASSEMBLY.)
No The system is normal.
Yes Go to the next step.
No Replace with the appropriate standard fuse.
• If the fuse is melted, inspect the wiring harness for short
to ground. Repair or replace the wiring harness, then
replace the fuse.
Yes Go to the next step.
No If poor connection of audio unit connector:
• Securely connect the audio unit connector.
If the audio unit side connector is wrong:
• Replace the audio unit.
If the wiring harness-side connector is wrong:
• Repair or replace the pins and/or the connector.
ACTION
id0903e2803100
ACTION
09-03D–5
09-03D